A Gadget with the Minor Good Trait looks like something perfectly ordinary. That Engineer’s Mate looks just like a wrench until you switch it on, the Scanner’s built into your bog-standard laptop, and your jeep looks completely normal until you switch it to flight mode. In fact, your Gadget won’t even show up as alien technology until you’re actually using it. A Gadget with the Major Good Trait has a perception filter built into it. People ignore it except when it’s in active use, and sort of forget about it afterwards.